Color Conversion Substrate With Nested Filter Layers for Light Efficiency
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Solution Overview
Problem
Existing flat panel display devices, particularly organic light emitting display devices, face challenges in manufacturing costs due to complex color conversion layers and inefficient light management.
Innovation Solution
A color conversion substrate with a layered structure of first, second, and third light emitting areas, surrounded by a light blocking area, and multiple color filter layers that transmit different colors, including a color conversion layer with specific opening configurations to optimize light emission and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex color conversion layer is used to achieve better color performance, then display quality is improved, but manufacturing cost increases
Solution Approach 1:
The color conversion layer is divided into multiple sub-layers, with each sub-layer containing color conversion particles of a specific wavelength range. This segmentation allows independent optimization of each sub-layer's particles while simplifying the overall manufacturing process by enabling selective deposition and reducing the complexity of creating a single complex layer.
Solution Approach 2:
Different regions of the color conversion layer are assigned different functions - some regions handle specific wavelength conversions while others handle different color ranges. This local differentiation optimizes color performance in specific areas without requiring the entire layer to be complex, thereby reducing overall manufacturing cost.
2Productivity
If traditional light management structures are used, then device structure is maintained, but light emission efficiency is insufficient
Solution Approach 1:
Multiple color filter layers are nested beneath the substrate, with each layer positioned at specific depths. This nested arrangement allows light to pass through multiple selectively transparent layers, improving light emission efficiency without requiring complex external light management structures.
Solution Approach 2:
The patent introduces a vertical dimension to light management by positioning color filter layers at different depths beneath the substrate. This three-dimensional arrangement optimizes light paths and emission efficiency without adding lateral complexity to the device structure.
3Reliability
If multiple color filter layers are added to improve color performance, then display quality is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple color filter layers are merged into a single integrated structure beneath the substrate, where each layer is selectively transparent to specific wavelengths. This merging approach consolidates what would otherwise be separate components into a unified light management system, improving color performance while reducing manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed substrate design enhances light management and reduces manufacturing costs by optimizing light emission efficiency and layer alignment, thereby improving the overall performance and cost-effectiveness of display devices.
Implementation Method 1
The color conversion layer may convert a wavelength of light provided from the organic light emitting element. Accordingly, the organic light emitting display device may emit light having a color different from a color of an incident light.
Data Source
AI summary
A color conversion substrate includes first, second, and third light emitting areas, and a light blocking area surrounding the first, second, and third light emitting area, a first color filter layer overlapping the first light emitting area, and having a first opening exposing a portion of the substrate, a second color filter layer under the substrate and the first color filter layer, overlapping the second light emitting area, and having a second opening exposing a portion of the first color filter layer, and a third color filter layer under the substrate and the second color filter layer, overlapping the first light emitting area, and having a third opening exposing a portion of the second color filter layer and a fourth opening exposing a portion of the first color filter layer.